EPA Method 507 Nitrogen Phosphorus Pesticide Back Catalog number: 31882 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673648 Paraoxon-ethyl, 100 µg/ml, Ethyl acetate, 5ml Price on request 672899 Chlorfenapyr, 100mg Price on request 672980 Trimethoprim, 250mg Price on request